Darren Dixon was in a relationship with Jones, known as the ‘White Widow’, and is believed to be the father of Jones’s 12-year-old son, JoJo, who she took with her to Syria.

The 50-year-old woman is believed to have been killed in a US drone attack in June as she tried to flle the group’s stronghold in Raqqa, though US intelligence chiefs say they cannot be 100% sure as no attempts were made to recover her DNA.

Sally Jones fled Britain with her 10-year-old son to join Islamic State extremists.